Which structure in plant cells is analogous to the centrosome in animal cells?

The correct answer is B: Plasmodesmata. While plant cells lack true centrosomes with centrioles, plasmodesmata serve similar intercellular communication functions. However, most plant cells lack a distinct MTOC (microtubule-organizing center).

Which of the following best explains why objects appear to move slower underwater?

The correct answer is B: Light refracts when passing from water to air, changing apparent position and velocity. Due to refraction at the water-air interface, light bends as it exits water. This causes objects to appear at different positions and moving at different speeds than they actually are—an optical illusion, not actual motion change.

An electron undergoes a transition from n=3 to n=1 in a hydrogen atom. Which series does this transition belong to?

The correct answer is C: Lyman series. The Lyman series involves transitions to n=1 from higher energy levels. Balmer series ends at n=2, Paschen at n=3, and Brackett at n=4.

Which of the following elements has the highest electronegativity value on the Pauling scale?

The correct answer is A: Fluorine. Fluorine has the highest electronegativity value of 3.98 on the Pauling scale, making it the most electronegative element. This is because it has the smallest atomic radius and the highest effective nuclear charge among all elements, causing it to attract electrons most strongly in a chemical bond.

A ball is thrown vertically upward with initial velocity 20 m/s. What maximum height does it reach? (g = 10 m/s²)

The correct answer is B: 20 m. At maximum height, v = 0. Using v² = u² - 2gh: 0 = 20² - 2(10)h. 20h = 400. h = 20 m.

Home

Home › Subjects › General Science › Physics

General Science
Physics

Physics, Chemistry, Biology and more

53 Q 8 Topics Take Mock Test

Difficulty: All Easy Medium Hard 51–53 of 53

Topics in General Science

All Physics 106 Chemistry 9 Biology 2 Botany 78 Human Body 4 Disease & Health 2 Space & Astronomy 5 Environment 1

Q.51 Medium Physics

A lens has a focal length of 15 cm. What is its power?

A +6.67 D

B -6.67 D

C +2.25 D

D -2.25 D

Correct Answer: A. +6.67 D

EXPLANATION

Power P = 1/f (in meters). P = 1/0.15 = 6.67 Diopters (positive for converging lens)

Test

Q.52 Medium Physics

Speed of sound in air?

A 300 m/s

B 343 m/s

C 400 m/s

D 250 m/s

Correct Answer: B. 343 m/s

EXPLANATION

~343 m/s at 20°C.

Test

Q.53 Medium Physics Space Science

The escape velocity from the surface of a planet depends on which two fundamental properties of that planet?

A Radius and temperature

B Mass and radius

C Density and temperature

D Atmospheric pressure and mass

Correct Answer: B. Mass and radius

EXPLANATION

Escape velocity is mathematically derived as v = √(2GM/R), where G is gravitational constant, M is the planet's mass, and R is its radius.

These two properties directly determine the gravitational field strength at the planet's surface, which defines the minimum velocity needed to escape gravitational attraction.

Test

1…4 5 6

All Subjects & Topics

Govt. Exams

Entrance Exams

Teacher Exams

Subjects

Quick Links

General Science Physics

General Science
Physics